In the 3rd year of the Tang Dynasty, King Jin 'Lee Se-min' achieved a great victory at the Battle of Miryangcheon and received the emperor's trust and welcomed the princess of the ruined kingdom as his concubine. On the other hand, an incident occurs in which the inns of Sanggung-guk, which were making wedding dresses, are killed one after another by a 'murder maniac', and as 'Jilnageum', 'Eyeopung' and 'Hyeolmiang' dig into the case, they intuit that a mysterious background exists. … Will they be able to reveal the identity of the 'murder maniac' and solve the mysterious case?